Pricing my B2B SaaS is breaking my brain - looking for feedback

I've spoken to several customers and BETA users trying to determine the correct pricing model for Hello Inbox.

Originally I thought a pay-as-you-go system was the right approach, but after speaking to a few BETA users and customers it turns out maybe that isn't the best approach because several of my features require recurring use.

I thought about it for a few days and eventually settled on a monthly subscription model with limitations.

My ICP are professionals and solo-entrepreneurs and small to medium sized business and marketing teams.

So I eventually landed on this pricing model, see below screenshot.

Would love some feedback from the community here if I'm mistaken or if there's something I missed.

Questions:

1. Pay-as-you-go or subscription?
2. Is pricing too low or too high?

Here's some additional screenshots for context.